JPH039789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for applying two-tone coating to an automobile body.

[Prior art] Two-tone painting of automobile bodies, for example,
This is done as shown in the figure. That is, a first color coating 31 is applied on a body 30 that has been coated with a base coating, and a masking tape 33 is pasted on the boundary between the first color coating 31 and the second color coating 32, and then the masking tape 33 is applied via an adhesive 34. A masking paper 35 is pasted to cover the first color coating 31. Next, the second color paint is sprayed from the paint gun 36 to apply the second color paint 32.
After that, masking tape 33, masking paper 3
Complete the two-tone painting by removing 5.

[Problems to be Solved by the Invention] However, in the conventional two-tone coating method, the work of masking the first color coating 31 is extremely complicated and reduces productivity.

In view of the above points, the present invention provides a multicolor coating method that does not require conventional masking.

[Means for Solving the Problems] That is, the present invention provides two-tone coating by spraying paint onto an automobile body, which is an object to be coated, in the top coating process of an automobile. The air is blown out from an air nozzle with a slit-shaped tip hole to form an air curtain, and the paint particles sprayed by the air curtain adhere only to the desired area on the car body. This invention relates to a multicolor painting method characterized by painting.

[Example] Next, the present invention will be explained based on the drawings.

FIG. 1 is an explanatory drawing showing one embodiment of the present invention, and this embodiment shows a first color coating and a second color coating on an object to be coated.
This relates to two-tone painting in which color painting is applied sequentially.

In FIG. 1, reference numeral 1 denotes an automobile body, which has been previously coated with a base coating such as electrodeposition coating or intermediate coating. Reference numeral 2 denotes an automatic painting device, which is equipped with a side painting gun 3, which is reciprocated in the vertical direction by a reciprocating drive device 4.

First, in the same manner as in the case of conventional two-tone painting, the first color paint is spray applied to the lower side of the body 1 using a paint gun, and baked to apply the first color paint 1.
Get 0.

Next, paint the second color 11 on the upper side of body 1.
In this case, air is blown from the air nozzle 5 toward the boundary with the first color paint 10 to form an air curtain 6, and in this state, the second color paint is sprayed by the paint gun 3. Apply the second color coating 11. At this time, since paint particles traveling in the direction of the first color coating 10 beyond the boundary with the first color coating 10 are blocked by the air curtain 6, the second color coating 10 is Color paint particles do not adhere. In this way, two-tone painting can be performed without performing masking using conventional masking tape or masking paper.

In the embodiment shown in FIG. 1, the first color coating 10 may be applied in one coating booth, and then the body 1 may be transferred to another coating booth and the second color coating 11 may be applied, or the same coating may be applied. The first color coating 10 and the second color coating 11 may be sequentially applied in a booth.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention, and this embodiment relates to two-tone coating in which a first color coating and a second color coating are simultaneously applied to an object to be coated.

The automatic painting apparatus 20 in this embodiment includes two side painting guns 21 and 22, which are reciprocated up and down by a reciprocating drive device 23. The side painting gun 21 is for painting the lower side of the body 1, and the side painting gun 22 is for painting the upper side of the body 1.

Air is blown from the air nozzle 5 toward the boundary between the first color coating 10 and the second color coating 11 to form an air curtain 6, and in this state, the coating gun 21 and the coating gun 22 are used to The first color paint 10 and the second color paint 11 are simultaneously applied by spraying the first color paint and the second color paint.
At this time, the air curtain 6 prevents the first color paint particles and the second color paint particles from mixing, resulting in a two-tone coating.

In the embodiment shown in Fig. 2, it is possible to apply the first color and the second color at the same time, but this is completely impossible as long as conventional masking methods are used. . In this embodiment, two automatic coating apparatuses 2 as in the embodiment shown in FIG. 1 may be installed on each side so that the first color coating and the second color coating are shared.

In the present invention, the air curtain 6 may be formed to prevent sprayed paint particles from scattering to areas other than the desired area, but the width thereof is usually 20 to 25 times the diameter of the paint spray pattern.
It is said to be about twice as much. In addition, the thickness of the air curtain 6 varies depending on the flow velocity of the blown air, etc., but usually
A thickness of about 3.5 to 4 cm is sufficient. The air flow rate depends on the flow rate of paint particles, but is usually about 5 to 50 m/sec. It is preferable that the air nozzle 5 has a slit-like hole.
An air curtain as described above is formed by arranging one or more of them. In the present invention, if the finish of the boundary part between the first color coating 10 and the second coating 11 is not good, the boundary part should be covered with tape such as stripe tape, protection molding, roof drop molding, etc. It is preferable to set it at a location where

In the above, the present invention has been explained using two-tone painting of an automobile body as an example, but the present invention is not limited to such an example, and can be applied to three-color or more multi-color painting. In addition to automobile bodies, the objects to be coated include home appliances, office equipment, and other vehicles such as trains.

[Effect of the invention] By preventing the paint particles of each paint color from crossing the boundaries and adhering to areas other than the desired area using the air curtain, masking using masking tape, masking paper, etc. is not required. It is possible to perform two-tone painting on the car body, and since there is no dust scattering to unnecessary parts, two-tone painting can be performed without carrying out the base polishing before painting the second color, which is usually done, which increases productivity. is improved.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing respective embodiments of the present invention, and FIG. 3 is an explanatory diagram showing a conventional two-tone painting method. (Main symbols in the drawing), 1: Automobile body, 3,
21, 22: Painting gun, 5: Air nozzle, 6: Air curtain, 10: First color painting, 11: Second color painting.

Claims (1)

[Claims] 1 During the top coating process of automobiles, when spraying paint onto the automobile body to achieve two-tone painting, air is supplied from an air nozzle with a slit-shaped tip hole located near the boundary line between the two coating films. A multicolor painting method characterized by forming an air curtain by blowing out air curtains, and performing two-tone painting by spray coating in such a manner that paint particles sprayed by the air curtain adhere only to desired areas on an automobile body.